docs: def get_weekly_chart_dates(self):
          """Returns a list of From and To tuples for the available charts."""
  
          doc = self._request(self.ws_prefix + ".getWeeklyChartList", True)
  
          seq = []
          for node in doc.getElementsByTagName("chart"):
              seq.append((node.getAttribute("from"), node.getAttribute("to")))
  
          return seq